Thermo-optic distortions often limit the beam quality and power scaling of high-average-power lasers. Cryogenically cooled Yb:YAG is used to efficiently generate 165 W of near-diffraction-limited beam from a power oscillator with negligible thermo-optic effects. End pumped with 215 W of incident pump power from two diode modules, the laser has an optical–optical efficiency of 76%, a slope efficiency of 85%, and an M<sup>2</sup> value of 1.02.
© 2004 Optical Society of America
Daniel J. Ripin, Juan R. Ochoa, R. L. Aggarwal, and Tso Yee Fan, "165-W cryogenically cooled Yb:YAG laser," Opt. Lett. 29, 2154-2156 (2004)